Cisco IOS basics & CLI modes
How the Cisco IOS command line works: user EXEC vs privileged EXEC vs global configuration mode, moving between them, getting help with ?, and saving your config.
Learn track
Cisco
IOS CLI, VLANs, routing & ACLs
Configuring VLANs in IOS
Create VLANs in Cisco IOS, assign access ports, configure a trunk between switches, and verify it all with show vlan brief and show interfaces trunk.
Static routes & OSPF in IOS
Configure a static route and a default route in Cisco IOS, turn on OSPF with router ospf and network statements, and verify with show ip route.
ACLs in IOS
Write standard and extended ACLs in Cisco IOS, apply them to an interface with ip access-group, and avoid the implicit deny-all mistake every beginner makes once.
Reading show command output
Decode the Cisco show commands you will use daily: show ip interface brief, show ip route codes and brackets, and the four up/down interface states and what each means.